as derek ward explains, it's threatening to put them out of business. >> reporter: the food trucks have seemed to multiply over the past couple of years. you can get just about anything. >> i just tasted some beef brisket from the barbecue truck down there. >> reporter: but many vaendors what they're getting is squeezed from d.c. regulatory agency and the city's department of transportation. >> no idea of balancing needs just we're not seeing eye to eye on that. >> reporter: the guidelines for where the vendors could set up. they circle the park, but if the new regulations went into effect, all these trucks park here would be breaking the law. >> 7'5" of space here. >> reporter: the proposed new rules would require ten fealt of clear sidewalk space for the trucks to operate in the central biz district, which is pretty much where all the hungry workers are. this sidewalk would be compliant and this is wide enough that even with these obstructions have people walk by. but the vendors say there are not enough places like this for this not to hurt them. >> eighth out of ten hot spots wouldn